Steering
9803/3280 Issue 1
Steer Unit Operation
- 4 Wheel Steer Machines
4 Wheel Steer Mode
- Neutral
Flow from the priority valve enters the steering unit
through the bottom right hand port past the non-
return valve 43C. When the steering wheel is
stationary the inner spool A and sleeve B are held
in the neutral position by the centring springs K. As
the unit is 'closed centre' the flow from the pump is
dead ended by the steering unit.
Component Key:
A Inner Spool
B Sleeve
D Stator
K Centring Springs
X Steer Mode Control Valve
43C Non-Return Valve
In 4 wheel steer mode the spools of the steer mode
control valve X are configured as shown.
4 - 2 4 - 2
Circuit Descriptions
Section H Section H
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